Starting and stopping mechanism



Oct. 21. |924.

W'. C. STEWART Y "STARTING AND STYOPPING' MEGHANISM Fnedec. 14. 1918 2 sagem-sx1. 2

Patented Get. 21, 1924.

UNiTED STATES VVILIJIAM.` C. STEWART, 0F SWAMPSCOTT,

lti

PATENT orner.

MASSACHUSETTS, ASSIGNOR TO UNITED SI-IOE MACHINERY CORPORATION, OF PATEK-SON. NEW JERSEY, A CORPORATION OF NEV JERSEY.

STAR/'PING AND STOPPING MECHANISLVI.

Application filed December 14, 1918. Serial No. 266,756.

To all Iwhom t may concern.'

Be it known that I, WILLIAM C. S'rnwanr, a subject of the King of England` residing at Swampscott, in the county of Essex and State of Massachusetts, have invented certain'Improvementsl in Starting and Stopping Mechanisms, lof which the following description, in connection with the accompanying drawings, is a specification, like reference characters onv the drawings indicatinglike parts in the several lignres.

This invention relates to starting and stopping mechanisms and, particularly, to starting and stopping mechanisms constructed and arranged to effect either a predeteA mined numb-er of machine cycles and thon stopautomatically, or, at the will of the operator, to elect continuously and uninterruptedly an indefinite number of cycles.

The invention is illustrated and described herein as applied to a perforating machine of the type shown in United States Letters Patent No. 955,711, although it is not restricted to such use.

In a common use of machines of this type for making perforated designs upon the vamps, tips or other portions of shoe uppers, it is often desired, owing to sharp change in the curvatures of the designs that are used, to locate the work carefully before each perforation is made. For such use it is desired that the machine be capable of stopping after a single perforation only has been made, so as to permit relocating the work for the succeeding perforation in order to follow Yaccurately the desired outline. However, on other portions of the work, as when the outline is straightenthe machine may properly be run uninterrnptedly at a high rate of speed and many perforations be made before it is necessary to stop the machine.

As such machines have been organized heretofore, they have not satisfied the modern requirements of the trade for high speed of ope ation for the following reasons, among others: First, with increased speed the strain placed upon the clutch has been so great as to cause excessive breakage of parts, and second, it is very difficult, if not almost impossible even at relatively moderate speeds, to operate a controlling treadle quickly enough to cause the machine to have only a single cycle when no more are desired. This often causes considerable damage to the work because additional perforations are made in wrong positions beforey the work can be relocated. In perforating' machines of the said type, aspeed of 700 to SOO revolutions per minute has been found to be practicable but this speed is considerably too high for any but expert operators to catch the clutch when only a single revolution or cycle of the machine is desired.

An object of the present invention is to provide a starting and stopping mechanism adapted, among other uses, to be incorporated in a machine of the type above mentioned, which mechanism will be organized to provide for properly stopping the machine even at high speeds after a single revolution or after a single cycle only, but which may also be operated uninterruptedly whenever repeated cycles are desired.

Another object of the invention is to proA vide a mechanism which will come to a full stop promptly but in a comparatively gradual manner so that the parts will not he broken, even at high speeds. To insure positive stopping without undue shock or strain, the organization is such that the ef fective braking force ofthe mechanism in-r creases proportionately to increases in ma-4 chine speed.

Starting and stopping mechanisms have been designed in which a machine may be run continuously by a partial. depression of the treadle and may be caused to have only a single cycle upon a complete depression of the treadle. Such mechanisms have been used principally in slow yspeed machines, such as punch presses and the like. This mode of operation, however, would be particularly undesirable and even dangerous in a perforating machine7 or other high speed machine, because the machine would.

have more than one cycle unless the treadle were completely depressed to the full eX- tent of its stroke before the machine had passed. through a complete cycle. To meet this objection7 the starting and stopping mechanism of the present invention is so constructed and arranged that a partial depression of the treadle, or a partial move ment of other manually controlled means,

will cause the machine to have only one cycle and only by particular conscious effort upon the operators part can the machine be caused to have, uninterruptedly, an indefinite number of cycles, this being accomplished by a. more extended depression or movement.

ATo make the starting and stopping mechanism more convenient by eliminating unnecessary movements of the treadle, the mechanism is so constructed and arranged that after a single cycle, or at any time that the treadle is in midposition, a more extended depression of the treadle will cause the machine to run uninterruptedly while a partial return of the treadle, as to its mid-position, will stop the machine. rvlhus it is not necessary to return the treadle to the Yupward limit of its movement and then to make a full downward stroke to control the machine each time several cycles are desired, although this can be done if desired. After a single cycle, vor at any time that the-tre'adle is in mid-position, a further single cycle of the operations may be secured by raising the t-readle to its uppermost position Vard then depressing it again to 1nidposition. v

It is important, in the operation abovedescribed, that the operator be able to feel when the treadle is in its mid-position. To this end, in the illustrated construction, an additional resistance to the movement of the treadle is provided when this position is reached on its downward movement suflicient to apprise the operator of the midposition. This additional resistance isA removed when the mid-position is reached on the upward stroke. The operator is thus always enabled to ascertain when the treadle is in the mid-position by noting the point at which this additional resistance is met with or is removed.

In accordance with other features of the and a brake band constructed and arranged to revolve with the brake drum during the operation of the machine and to have alimited rotation relative thereto during the stopping of the machine, the mechanism being so designed that a continually in# creasing force is applied to the brake drum until the forward movement of the machine has been arrested so that the machine is stopped in a comparatively gradual manner, while stopping of the machine is assurcd because the mechanism is sojarranged that the force applied to the drum increases when it is necessary to overcome increased momentum dueto higher running speeds of the machine.

Ithas been usual in mechanisms of the general type above-mentioned to have a brake which is applied to the shaft before the clutch is released and such brake usually remains in operation until after the machine has been started again, thus putting unnecessary loads upon both the driving means and the brake. By the present invention, however, this difiic'ulty has been overcome by arranging the brake so that it is not applied until the time that the clutch is disengaged or slightly thereafter and the brake is released at the time that the. clutch is engaged for starting. n

These and other features of the invention, including various combinations and parts and details of construction lwill'now be described in connection with the accompany'- ing drawings forming part. of this specifi cation.

In the drawings 1 a Fig. l shows the starting and Stopping mechanism applied to the perforating machine of the patent referred toabove;

Fig. 2 shows a rear end elevationY of sai-d mechanism; r

Fig. 3 is a sectional view of the `clutch and bralre parts talrenalong/the line 423e-3 in Fig. 2; A y Y Fig. i is aV sectional view of a portion of the clutch and brake parts` taken along'the line 4 4; in Fig. 3;

Fig. 5 is a perspective view of the start ing and stopping mechanism; and

Figs. 6, 7, 8 and@ show details of construction to'befdescribed.

The machine is'provided with a stepped driving pulley 20 which is loose upon the shaft 22 but which may be engaged therewith by means of a Horton clutch. This clutch consists of the usual cam member 24 secured to the shaft by means cfa pin 26. Upon a cylindrical portion ofthe cammember is mounted the usual roller cag'ej28, one

of the rollers bein-g'shown at 3 0. When per mitted, the roller cage is forced forward in the direction ofA rotation of the pulley means of a compression spring 32 to causeY pin S4 located in the cam member 24. The

roller cage is moved relatively backward to unclutch the rollers when the lug 38 onthe cage is permitted to striltea stop dog 40, which may be moved into or out of operative position in a manner to be'described. rEhe stop dog is yieldingly mounted upon va rod 42, the yielding movement being Ypermitted by means cfa compression spring 43 mounted on the rodA above the; dog, and the amount of initial compression given to the spring being adjusted by means of a nut 44e and check nut The clutch and its disengaging mechanism above described is that usual in Horton clutches and forms no part of the present invention, per se.

The machine is started by swinging the rod l2 so that the dog l() becomes disengaged from the lug 88, thus permitting the roller cage to spring forward and cause the pulley 2O and shaft 22 to be clutched together by means of the rollers and the cam member 24;. The mechanism for swinging the rod Ll2 will now be described Vhen the treadle rod 47 is depressed, the rear end of a pivoted lever e8 is raised. This lifts a pin i9 slidingly mounted in the f ame the machine, (see Fig. 9). This pin engages a. lever o() fixed to the shaft 52. ln this manner, when the treadle-rod l? is depressed, the shaft 52 is turned, against the resistance of the spring 58, to a limited extent in a clockwise direction (see Figs. 2 and and this swings a lever ll attached to the shaft 52 so that a notched member 56, pivoted on the lever 5d and engaging an ear on a latch 58, moves the latch in counter clockwise direction. This latch then becomes disengaged from a latch plate 8O mounted upon a projection 61 of a cam 1lever 62, cansino' the Y machine to start, as will be explained later. The cam lever 62 is a portion of a swinging member 64 mounted to swing freely upon the shaft 52. The swinging member 8l has an extension 86 in which the rod 42, above mentioned, is mounted and also has another extension 68 for a purpose to be described. This swinging member has a lJ-shaped portion 7() which straddles a bear ing 72 extending from the frame of the machine, which bearing forms a support for the shaft 52. A compression spring 7e ten s normally to swing this member in a clockwise direction but it is restrained from doing so by the engagement of the latch 58 with the latch plate 68. When the treadle is depressed and the latch 38 is disengaged, the member 64, forced by the compression spring 7d, swings in a clockwise direction and disengages the dog l0 from the lug 88, thereby starting the machine. The swinging ofthe member (Se carries the extension 68 thereof into such a position that the stud 80, mounted on said extension, strikes the notched member 56 and swings it about its pivot 82, against the action of the tension spring 88, so that its engagement with the latch 58 in the notch 84 is released, the engagement being transferred to the lower notch 88. Then the latch 58, moving in the notch 86, is forced towards its original posit-ion by means of coiled spring 88. However, owing to the movement of the swinging member G4, the latch plate 60 is above latching position and the latch 58 is spring pressed against the projection 61 of the swinging member 64,

ready to engage the latch plate 60 as soon as the projection 6l is brought down into locking position. The swinging of the member caused by the compression spring 74, also carries the cam roll 76, on the cam lever 62, into engagement with a cam 7 8 mounted on the shaft 22 of the machine. its the shaft and cam have now started to revolve, (because the stop dog/l0 has been disengaged) the cam lever 82 is operated by the cam 78 to swing the swinging member 8e: back towards its original position. When this movement has continued sufficiently, the latch plate G0 is brought into position to be locked by the latch 58. rllhe swinging member 84 thus lo: iked in position so that the stop dog 40 is in position to disengage the clutch and stop the machine at the completion of a single revolution.

All of the above operations have been contingent upon the fact that the treadle rod has been only partially depressed and the lever made only a portion of its possible movement. The operator is enabled to determine this position of the treadle by means of a spring-pressed stop plunger located in an arm 92 of the lever 50 l fixed to the shaft 52, the plunger engagingvthe frame of the machine when the treadle has been depresse-d sufficiently to cause the above-named operations to taire place. This position of the treadle rod may conveniently be called its micli-position7 and may be adjusted by means of the nuts 95.

I lf the operator wishes to have the machine run continuously, after the treadle is in its mid-position, a more extended movement is given thereto, an additional pressure being required thereon to overcome the resistance of a spring 98 behind theplunger 90. vWhen the treadle is depressed to its full downward limit, determined by the adj stable stop screw 94 striking the frame 98 of the machine, the notch 8G, with which the ear 59 of the latch 58 has been or will be engaged by the first revolution of the machine, will, on account of the more extended clockwise movement of the lever 5e, bein a position to hold the latch 58 in inoperative position so that the swinging member cannot be locked in position. The swinging member 64;, therefore, is moved continuously, the cam 78 moving it in one direction and the spring Til moving it in the other direction. However, as the cam roll 78 is on the low part of the cam whenever the lug 38 is opposite the stop dog 40, the stop dog can not come into contact with the lug and so the clutch cannot become disengaged. A@iccordingly, the machine will run continuously until the operator allows the treadle to return to either its mid or uppermost position. `l/Vhen the treadle is returned to either of these positions, the lever 54: is brought back to a position to permit the latch 58 to engage the latch plate so that the stop dog 40 will be held in position to engage the lug 38 and stop the machine as soon as the stopping position is reached. turned only to mid-position, the ear 59 of the latch 58 remains in engagement with the notch 86, but, if the treadle rod is returned to its uppermost position, the ear 59 slips out of engagement with said notch and into engagement with the notch 84, the spring 83 snapping the lever 56 into this position; in either case the parts are left in proper position for subsequent operations of the treadle rod in the manner before described.

In order to stop the machine smoothly when the stop dog operates, a band brake device is employed. This is of novel constructionand constitutes an important feature of the invention. By its use it is possible to stop the machine smoothly, even when running at a high rate of speed. tion and operation will now be described A brake drum 100 is employed, which, for convenience, is made as an enlarged integral portion of the cam member 24, fiXedly mounted upon the main shaft 22 thatl it is desired to stop. (3o-operating with this brake drum is a brake band consisting` of a flexible metal band 101 to which is secured a leather facing 102. The operation of the brake band is unusual in that it is arranged to revolve with the brake drum and is also arranged to have, at times, a. limited relative angular movement thereto, as will be eX plained in detail later. In order to maintain the band in position, it is prevented from movement in a direction longitudinally of the shaft by means of a flange 104 on one side and on the other side by means of a cover plate 106 forming a similar flange.'

To prevent it from being thrown off the drum by centrifugal force its ends are loosely connected together by a link 108. This linlris fastened to the ends of the band by pins 110 and 112, 'the latter one of which operates in a slot in the link to permit the band to expand and contract to release or apply braking action to the drum, The band is yieldingly held in angular position relatively to the drum by means of a tension spring 114, (shown broken away in the drawings) one end of which is fastened to the pin 112 on the band and the other end of which is fastened to a pin 116 fixed relatively to the brake drum and located in a lug on the cover plate 106. As the pin 116 is ahead coverV plate 106. When relative ro'tationbetween the band and drum occurs, as will appear later, Vthe projection 118 is separated lf the treadle rod is rei lts construc from the face 120 and 'the relative rotation or angular displacement, if not otherwise( prevented, may occur until anotherprojection 122 on the brake band engages the ridge 124'of the cover plate (see Fig. 5). Two oppcsitely hook-shapedl projections 1,26 and 128 aielocated respectively one on each end of the band. The end carrying the projection 126 will be called the forward end because it is the endv that first reaches a given` point during rotation. The projection 126 is similar to the lug 38 on Vthe roller cage and when the Vmachine'is to be stopped, said projection 126 engages the stop dog 40 in a manner similar to but, preferably, ata time slightly laterthan, the lug 38 (i. e. after the clutch is disengaged). This engagement of the stop dog and projection v126 causesl the brake band to wrap around the brake drum in a manner similar to the/action of a rope around a capstan, this action being due mainly to the spring 114. The faster that the machine isVV revolving the `greater this wrapping and consequent brakingactionbecomes. rlhis is due to the fact'that, when the speed of the machine is increased, the momentum of the brake band is increased, causing the yielding spring 43 to be compressed to a greater extent upon'engagement of the stop dog 40 with the projection 126 on the brake band 101 so that agreater force is exertedl upon the band. Furthermore, the momentum at higher speeds allows the shaft to revolve to a greater extent before stopping, which causes Jche pin 116 vto move to a greater distance relatively to the pin 112, stretching further the spring 114 and producing a greater pull upon that end of the band. The springs 114 and 43 act-ing in oppositionto each other uponopposite ends of the brake band to contract it causes, therefore, a greater braking' force tokbe eX- erted upon the brake band to stop the machine when the machine is being run at higher speeds. l/Vith this novel construction, `the machine is stopped comparatively gradually, without undue shock or vibration, because, during the stopping operation, the springs 114 andA 43 are acting with a continually increasing force upon the brake band until the forward movement of the machine is arrested. yThese parts are adjusted` movement of the machine if the brake band should fail to operate properly. Y

rlhe movement of the V swi-ngirig member 64 which 'brings the stopl dog 40 into operative position also brings a latch 130, which is' pivotally mounted on said member, into opera-V tive position. When in this position, the latch will yield because of the spring 131, and permit both hook-shaped projections 126 and 128 of the brake band to pass by it when the brale band moves forward. It will, however, prevent any backward movement of the projection 128 beyond the upper end of the latch. When the forward movement of the machine has been stopped, as described above, the stop dog 40 is in a raised position and the spring 43 is under entra compression. The spring 43 then reacts, forcing the stop dog 40 downward, causing the brake band to be turned slightly baciward and with it the machine, until the projection 128 is stopped by the latch 130. The pressure of the spring 43 then holds the brake band contracted between the stop dog 40 and the latch 130, preventing any movement of the machine until it is started again by a downward movement of the treadle rod 47.

vWhen the swinging member 64 is swung to disengage the stop dog 40 from the lug 38 to start the machine, the engagement of the ends of the brake band by the stop dog 4G and the latch 130 is released to permit rotation of the machine. 1t will thus be seen that the brake is released as the machine is started so that no unnecessary load is placed upon the driving means during starting and that the clutch is released when or before the brake is applied, so that no unnecessary load is placed upon the brake during stopping, thus overcoming a great fault of Horton clutch drives as heretofore constructed.

.ln order to simplify the foregoing description of the mechanism, a description of several adjustments has been omitted and these will be described below. These adjustments are for the purpose of overcoming those slight errors in manufacture which inevitably occur, for taking up wear of the parts and for providing for varying conditions met with in practice.

The stud 8O is eccentrica-Hy mounted in the extension 68 of the swinging member 64 in order that it may be made to strikethe nctched member 56 and give it the proper throw. This construction is shown in de tail in Fig. 7, which kis a sectional view taken at 7-7 in Fig.A 5.

he latch 58 is mounted on an eccentric stud secured to the frame of the machine by set screw 133 and this provides an adjustinent of the latch 58 which, in turn, determines the operative position of the member 64 so that the stop dog 40 will cooperate properly with t-he lug 38 of the clutch and with the projection 126 of the brake. This adjustable mounting of the latch is shown in detail in Fig. 8, which is a sectional view taken at 8-8 in Fig. 2.

The rod 42, upon which the stop dog 40 is mounted, may be raised or lowered by turning the threaded portion 134 in the tapped hole in the extension 66 of the swinging member 64. lWhen properly adjusted, the clamp bolt 136 secures it in position. By this adjustment, the time at which the stopping occurs may be adjusted as this determines the height of the shoulder 41 upon which the stop dog normally rests.

rhe operative position of the latch 130 is determined by the position of the stop screw 138 which is locked in position by the check nut 140. rlhe strength of the spring 131 which returns this latch into operative position, after the projections 126 and 128 have passed under it, may be adjusted by means of the screw 142.

For convenience, in the following claims the term manually operated means is used to indicate any means under the control of the operator and may include, therefore, a hand lever, the usual treadle, a knee lever or any other device under the control of the operator, because the present invention is not limited to the usual form of operating treadle. Furthermore, in the claims the term single cycle of operations7 is used to refer to any complete cycle of operations of the machine which may be completed in either a single revolution, in a fractional part thereof or even in a plurality of revolutions, if more than one revolution of the driving means be required for completing a single cycle of operations. Accordingly, the invention is not limited to machines in which one cycle of operations is completed in one revolution of the machine, although, to avoid complication, it has been so de scribed.

Hay/'ing thus described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States is -y 1. A starting and stopping mechanism comprising a driving member, a driven member, a clutch for connecting the driving and driven members, movable means under the control of the operator for rendering theV clutch operative, and automatic means for disengaging the clutch at a predetermined point in the cycvle of the driven member, said autematic means being operative when the movable means is moved to one position and being inoperative when the movable means is given a more extended movement to a second position.

2. A starting and stopping mechanism comprising a driving member, a drivenanember, a pair of brake members for stopping the driven member, movable means under the control of the operator for rendering the brake members inoperative, and automatic means for rendering the brake members operative at a predetermined point in the cycle of the driven member, said automatic means being operative when the movable means is moved to one position and being inoperative when the movable means is given 1 more extended movement to a second position,

` 3. A starting and stopping mechanism comprising a driving member, a driven member, a clutch for connecting the driving and driven members, a vgair or bralre members for stopping the driven member, movable means under the controi of the operator for rendering the brake members inoperative and' the clutch opeaitive, and automat-ic means for disengaging the clutch and rendering the brake members operative at a predetermined point in the cycle of the driven member, said automatic means being operative when the movable means is moved 'to one position and being inoperative when the .movable means is given amore extended movement to a second position.

e. si siarting and stopping mechanism comprising a driving member, a driven member, a Horton clutch for connecting the driving and driven members, movable means under the control orn the operator for rendering the clutch operative, and automatic means for disengaging the Horton clutch at a predetermined point in the cycle of the driven member, said automatic means being either operative or inoperative according' to the extent of movement of the movable means.

5. A, starting and stopping mechanism comprising a driving member, a driven member, a clutch for connecting the drivand driven members, movable means under the control of the operator for reu dering the clutch operative, and automatic means. for dise igaging the clutch after a predetermined movement has been, given to the driven member, said automatic means beii operative when the movable means is mmed from normal to one position and be ing inoperative when thc movable means is given a more extended movement toa second. position.

6. A. starting and stopping mechanism comprising a. `driving member, a driven member, a clutch for connecting the driving and driven members, movable means under the control of the operator for rendering the 'clutch operative, and automatic means for movable meansis moved to one position and Y being inoperative when the movable n ieans is given a. more extended movement lto a second position, and means for apprising the operator when the movable means is in a position to render the au-tomatic'means operative.

8. ln a starting -andstopping mechanism of the class described, a driving member, a driven member, means for connecting and disconnecting the driving and driven lmembes, manually operated controlling moans therefor comprising a member 'effective in one position to cause the driving member to impart a single cycle of operations only to the driven member and operating in another position to cause the driving member to impart repeated cycles to said member, and means effective whenV the first named position is reached for applying resistance to the movement of the vcont-rolling member in addition to the. resistance necessary to be overcoi'ne to move it to said first-named position.

9. ln a starting and stop-ping mechanism of the class described, a1 driving member, a driven member, means for connecting and disconnecting the driving and driven members, manirally operatedv controlling means therefor comprising a member effective in one position to cause the driving member to impart a` single cycle of operations onlyV be overcome to moveV it to said first-named brake band constructed and arranged to revolve therewith, mechanism for arresting the rotation of the brake band and effectingv braking action thereof when power is Withdravvn from the shaft, said mechanism including means acting to increase the braking action until the forward movement of the drum has been arrested.

11. In a starting and stopping mechanism lil() ot' the class descrilbed, a shaft, a driving member and a driven member on said shaft, means for connecting and disconnecting said driven `member and said driving member, a brake band constructed and arranged to revolve with the shaft when power is applied to the shaft, and mechanism for arresting the rotation oi the brake band and causing it to be eiiective when power is withdrawn from the shaft, said mechanism being organized to vary the braking action with changes in speed.

12. In a star-ting and stopping mechanism, in combination, va brake drum secured to a shatt which is to `be stopped, a brake band constructed and arranged to revolve with the shaft when power is applied to the shaft and Ato have a limited rotation relative ti ereto, and mechanism organized to arrest rota.- tion or' the brake Aband yieldingly and to cause the bra-ke band to be contracted yieldingly, said mechanism operating to increase the braking action progressively until the shaft is stopped.

1,3. A startin and stopping mechanism, having, in com ination, a brake drum secured 'to a shaft which is: to be stopped, a brake band constructed iand arranged to revolve therewith, yielding means for arresting the forward end of the bra-ke band, yielding means for causing the rear cnd ot the band to O'rip the brake drum, and means for continually increasing the gripping action until the forward `movernent ot the drum has been arrested.

le. A starting and stopping mechanism, having, in combination, a brake drum secured to a shaft which is to be stopped, a brake band constructed and arranged to revolve therewith, yielding means tor arresting the brake band, means for causing the band to grip the brake drum, means for increasing the gripping action until the torward movement of the drum has been arrested, and means for limiting backward movement of the brake band upon the reaction ot said yielding means.

l5. A starting and stopping mechanism. having, in combination, a driving member, a driven member, a clutch for connecting the driving and driven members, a brake drum mounted to move with the driven member, a brake band mounted to revolve with the brake drum and to have a limited rotation relative thereto, and a stop dog constructed. and arranged so that in its operative position it will disengage the clutch andengage the brake band to stop the driven member.

16. A starting and stopping mechanism, having, in combination, adriving member, a driven member, a clutch tor connecting the drivingand driven members, abrake drum mounted to move with the driven member, a brake band mounted to revolve with the brake drum and to have a limiter rotation relative thereto, and a stop dog constructed and arranged so that in its operative position it will disengage the clutch and engage the brake band to stop the driven member, said dog operating upon movement thereafter to its inoperative position to release the brake band and etiect operative engagement ot the clutch to re-start the machine.

i7. A starting and stopping mechanism, having, in combination, a driving member, a driven member, a Horton clutch tor connecting the driving and driven members, u brake drum mounted to move with the driven member, a brake band mounted to revolve with the brake drum and to have a limited rotation relative thereto, and a vielding stop dog constructed and arranged to disengage the clutch and thereupon to engage the brake band.

18. A, starting and stopping mechanism having, in combination, a driving member, a driven member, a Horton7 clutch 'for connecting the driving and driven members, a bra-ke drum mounted to move with the driven member, a brake band mounted to revolve with tie brake drum and to have a limited rotation relative thereto, a stop dog` Constructed and arranged to disengage the clutch and thereupon to engage the brake band, and means tor releasing the brake when the clutch is engaged.

19. 't starting and stopping mechanism,

J1 having, in combination, a driving member. a driven niember. a Horton clutch tor connecting the driving and driven members, lug projecting from one member ot the clutch, a stop dog movable into and out `ot the path. ot movement oit the lug, manuali); controlled means tor moving the stop dog out oit the path ot movement oit the lug to start the machine, automatic means tordreturning the stop dog into the path ot movement of the lug, locking means to retain the stop dog in said path to stop the driven member it only a partial movi Vvcnt o't the manuallycontrolled means is made, and means to prevent the operation ot the locking means upon a more extended movement cit the manually controlled means.

20, ln starting and stopping mechanism, Q combination, a stop dog, a svvinfin/irre` member upon which the stop dog is yieldingly mounted, an extension on the swinging member, a latch 'tor locking the swinging` member to hold the stop dog in operative position, a shatt upon which the swinginr member is loosely mounted, an armA tixedly mounted upon the shaft, a lever mounted upon the arm andv having` a plurality ot notches, some one ot which is engaged with the latch. at all times, said lever being constructed and arranged to move the latch out of locking position upon a limited turning movement of the shaft carrying the lever, a stud, mounted upon the extension on the swinging member, to engage they said lever and free the latch when the swinging member moves from locked position, and a cam for returning the swinging member to a position in* which the stop dog will become operative, the latch operating to lock the swinging member in position after this position has been reached. I

21. In a starting and stopping mechanism, in combination, a stop dog, a swinging member upon which the stop dog is yieldingly mounted, a latch for locking the swinging member to hold the stop dog in operative position, a shaft upon which` the swinging member isloosely mounted, an arm fixedly mounted upon the shaft, a notched lever mounted upon the arm, a plurality of notches upon the leversome one of which is engaged with the latch at all times, the notched member being constructed and ari ranged to move the latch ont of locking position upon a limited turningpmovement of the shaft carrying the lever, a stud mounted upon an extension of the swinging member to engage the notched member and free the latch whenl the swinging member moves from locked position, and a cam for returning the swinging member to a position in which the stop dog will become operative, the latch operating to lock the swinging member in position after this position has been attained, sa-id parts being relatively constructed and arranged to prevent the swinging member from being locked with the stop dog in operative position upon a more extended turning movement of the shaft carrying the lever and notched member. l

22. In a mechanism of the class described, a shaft, a power pulley turning loosely on the shaft, clutch mechanism for Vconnecting the pulley to the shaft and for automatically disconnecting it therefrom, a starting lever, and connectionsbetween th-e starting lever and the clutch mechanism, said connections being operative, upon actuation of the starting lever to a limited extent, to cause one revolution of the shaft to take place, and being operative, upon a more eX- tended actuation thereof, to cause a plurality of such revolutions to take place..

23. In a mechanism of the class described, a shaft, a power pulley loosely mounted on the shaft, a clutch for connecting the pulley to the shaft and for automatically disconnecting itv therefrom, a starting lever, and clutch controlling mechanism, said mechanism being operative to connect thepovver pulley to the shaft for one or for a plurality of revolutions upon actuation of they starting lever respectively through a short or greater predetermined distance in initiating shaft, a brake for the shaft, means operative to apply the brake at the end of a single revolution of the shaft, and means under the control of the operator for preventing the application of the brake at the end of said single revolution. Y

25. In a mechanism of the class described, a shaft, a power pulley loosely mounted on the shaft, a clutch for connecting the pulley to the shaft, a brake for the shaft, means for operating the brake to apply thesame at the end of one revolution of the shaft, and means under the control of the operator for preventing lthe operation of the brake at the end of said one revolution.

26. In a mechanism of the class described, a shaft, a power pulley loosely mounted on the shaft, a clutch for connecting the pulley to the shaft, a starting lever for controlling the clutch so arranged that the extent of movement of the lstarting lever determines whether one or more than one revolutionof the shaft is to take place, a braking means for stopping the shaft, and means for preventing the Vapplication of the braking means at the end of a single revolution when the clutch is set for a plurality of revolutions of the shaft.

27. In a mechanism of the class described, a shaft, a power pulley loosely mounted on the shaft, a clutch for connecting the pulley to the shaft, a starting lever for controlling` Va shaft, a clutch on the shaft for connecting the latter to the source of power, a brake operable to bring the shaft to rest, power means operative to apply the brake at a predetermined point in the revolution of the shaft, and a single operator controlled member for controlling the clutch to cause one or a plurality of revolutions of the shaft and for simultaneously controlling the brake'r so ilo that the latter is not applied until they end of the number of revolutions desired by the operator. y 1 Y In testimony whereof I have signed my name to this specification.

Y WILLIAM C. S'IEVVieIR'I.Y 

